<template>
   <div>
     <!--面包屑导航区-->
     <el-breadcrumb separator-class="el-icon-arrow-right">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>添加商品</el-breadcrumb-item>
     </el-breadcrumb>
     <!--卡片视图-->
     <el-card>
       <el-alert
         title="添加商品信息"
         type="info" :closable="false">
       </el-alert>
       <!--步骤条-->
       <el-steps :space="200" :active="active-0" finish-status="success" :align-center="true">
         <el-step title="基本信息"></el-step>
         <el-step title="商品参数"></el-step>
         <el-step title="商品属性"></el-step>
         <el-step title="商品图片"></el-step>
         <el-step title="商品内容"></el-step>
         <el-step title="完成"></el-step>
       </el-steps>
       <!--tab栏区域-->
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
         <el-tabs :tab-position="'left'"  v-model="active" :before-leave="beforeTabLeave" @tab-click="tabClicked">
           <el-tab-pane label="基本信息" name="0">
             <el-form-item label="商品名称" prop="goods_name">
               <el-input v-model="addForm.goods_name"></el-input>
             </el-form-item>
             <el-form-item label="商品价格" prop="goods_price">
               <el-input v-model="addForm.goods_price" type="number"></el-input>
             </el-form-item>
             <el-form-item label="商品重量" prop="goods_weight">
               <el-input v-model="addForm.goods_weight" type="number"></el-input>
             </el-form-item>
             <el-form-item label="商品数量" prop="goods_number">
               <el-input v-model="addForm.goods_number" type="number"></el-input>
             </el-form-item>
             <el-form-item label="商品分类" prop="goods_cat">
               <el-cascader
                 v-model="addForm.goods_cat"
                 :options="cateList"
                 :props="cateProps"
                 @change="handleChange">
               </el-cascader>
             </el-form-item>
           </el-tab-pane>
           <el-tab-pane label="商品参数" name="1">
             <!--渲染表单的Item项-->
             <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
               <el-checkbox-group v-model="item.attr_vals">
                 <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
               </el-checkbox-group>
             </el-form-item>
           </el-tab-pane>
           <el-tab-pane label="商品属性" name="2">
             <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
               <el-input v-model="item.attr_vals"></el-input>
             </el-form-item>
           </el-tab-pane>
           <el-tab-pane label="商品图片" name="3">
             <!--action 图片要上传到的后台API地址-->
             <el-upload
               action="http://127.0.0.1:8888/api/private/v1/upload"
               :on-preview="handlePreview"
               :on-remove="handleRemove"
               list-type="picture"
               :headers="headerObject"
               :on-success="handleSuccess"
               >
               <el-button size="small" type="primary">点击上传</el-button>
               <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
             </el-upload>
           </el-tab-pane>
           <el-tab-pane label="商品内容" name="4">
             <quill-editor v-model="addForm.goods_introduce">
             </quill-editor>
             <!--添加商品的按钮-->
             <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
           </el-tab-pane>
         </el-tabs>
       </el-form>
     </el-card>
     <!--图片预览-->
     <el-dialog
       title="图片预览"
       :visible.sync="previewVisible"
       width="50%"
       >
       <img :src="previewPath" alt="" class="previewImage">
       <span slot="footer" class="dialog-footer">
  </span>
     </el-dialog>
   </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      active: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: '',
        goods_weight: '',
        goods_number: '',
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 图片上传组件的headers请求头对象
      headerObject: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类的数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品数据失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择器选中项发生变化，会触发这个函数
    handleChange () {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (acticeName, oldActiveName) {
      console.log('即将离开的标签页名称是' + oldActiveName)
      console.log('即将进入的标签页名称是' + acticeName)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked () {
      // console.log(this.active)
      // 证明访问的是动态参数面板
      if (this.active === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败了')
        }
        console.log(res.data)
        res.data.forEach(item => { item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',') })
        this.manyTableData = res.data
      } else if (this.active === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败')
        }
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      console.log(file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象，push到pics 数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash  cloneDaeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态参数
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求 添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 5px 0 0 !important;
}
.previewImage{
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
